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One critical issue was a scientific understanding about the virus by itself. Virologists experienced come to think that variola could endure and replicate only within human beings. Quite a few viruses that cause illness in human beings may infect animals — consider Jenner’s cowpox. But variola had shed the chance https://leedirectory.com/listings12682048/a-simple-key-for-culture-of-the-united-states-unveiled

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